Hledger – Double-entry accounting from the Unix tools perspective (2012)
joeyh.name
joeyh.name
[1] http://ledger-cli.org/ [2] https://github.com/howeyc/ledger
The basic file format is the same, but there are differences - with a little care you can keep a file that works with both. Abandon and beancount's file formats are more different.
I'm happy to answer questions here or on #hledger. I've been using and growing hledger steadily since 2007; I just released 0.24 and we are thinking about a 1.0 one of these months.